EP0610132A1 - Ensemble pour l'écriture magnétique d'un message codé de précision sur un document porteur d'une piste d'écriture magnétique - Google Patents

Ensemble pour l'écriture magnétique d'un message codé de précision sur un document porteur d'une piste d'écriture magnétique Download PDF

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Publication number
EP0610132A1
EP0610132A1 EP94400212A EP94400212A EP0610132A1 EP 0610132 A1 EP0610132 A1 EP 0610132A1 EP 94400212 A EP94400212 A EP 94400212A EP 94400212 A EP94400212 A EP 94400212A EP 0610132 A1 EP0610132 A1 EP 0610132A1
Authority
EP
European Patent Office
Prior art keywords
magnetic
head
writing
track
write
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP94400212A
Other languages
German (de)
English (en)
French (fr)
Inventor
Bernard Carcenac De Torne
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Compagnie Generale dAutomatisme CGA HBS SA
Original Assignee
Compagnie Generale dAutomatisme CGA HBS SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Compagnie Generale dAutomatisme CGA HBS SA filed Critical Compagnie Generale dAutomatisme CGA HBS SA
Publication of EP0610132A1 publication Critical patent/EP0610132A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K1/00—Methods or arrangements for marking the record carrier in digital fashion
    • G06K1/12—Methods or arrangements for marking the record carrier in digital fashion otherwise than by punching
    • G06K1/125—Methods or arrangements for marking the record carrier in digital fashion otherwise than by punching by magnetic means
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B25/00—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus
    • G11B25/04—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus using flat record carriers, e.g. disc, card
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/08—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes
    • G06K7/082—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes using inductive or magnetic sensors
    • G06K7/083—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes using inductive or magnetic sensors inductive
    • G06K7/084—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes using inductive or magnetic sensors inductive sensing magnetic material by relative movement detecting flux changes without altering its magnetised state

Definitions

  • the present invention relates to an assembly for the magnetic writing of a high precision message on a document carrying a magnetic writing track.
  • the invention applies quite specially in the case of manual driving of the card in the read-write device, but also in the case of motorized driving if a magnetic synchronization reading track is used for the synchronization of write signals.
  • This information can be obtained by various additional means, but the known and safest solution is to use on the card itself, a magnetic synchronization track, also called a clock track, parallel to the track to be written.
  • This first track can moreover provide, in addition to the clock signal characterizing the advance of the card, permanent information associated with the clock signal if a self-carrying code of its clock signal such as coding is used. as for example the biphase or dual frequency code.
  • This synchronization of writing by a means characterizing the advancement of the card, necessary for manual movement, can also be used in motorized drive, that is to say that this drive does not ensure not a perfectly constant speed, either that the writing density tolerance is very narrow.
  • the head which reads the clock track must be located, in relation to the write track, at the right of the writing head, therefore in the vicinity thereof and the high leakage flux which is necessary to obtain the magnetic writing field disturbs the reading of the synchronization track by the reading head.
  • the object of the present invention is to propose an effective solution so that said clock track can be correctly read each time the synchronization read head is disturbed by the leakage field of the write head.
  • the invention therefore applies particularly to the case where the write track has a high coercive field but it also applies in all cases, because even when a lower coercivity of the track requires a lower power sent to the writing head, it nevertheless generates a leakage flux which can disturb the reading head and the useful signal to noise ratio may then not be sufficient to guarantee the required writing precision.
  • the subject of the invention is therefore an assembly for the magnetic writing of a precision coded message on a document carrying a magnetic writing track, the writing being carried out at saturation in the form of a binary code, comprising a magnetic writing head comprising a magnetic gap circuit equipped with a writing winding receiving the electrical writing signals, the sending of said signals being synchronized by means of a magnetic reading head comprising a magnetic circuit with air gap fitted with a read winding, said read head reading a pre-encoded magnetic track so that synchronization signals can be extracted therefrom, said magnetic write and pre-encoded tracks being parallel and neighboring l '' of one another, characterized in that it further comprises an auxiliary magnetic head comprising a magnetic circuit with an air gap equipped with an electric winding e, the auxiliary magnetic head being arranged symmetrically with the magnetic writing head with respect to the axis of said pre-encoded magnetic track, said writing and auxiliary heads being identical and their respective winding receiving the same current, the direction respective passage of said current in the respective winding of these two
  • FIG. 1 is a schematic view showing the arrangement of the different magnetic heads of a complete recording reader comprising the assembly for magnetic writing according to the invention.
  • Figure 2 is an enlarged partial view of Figure 1.
  • Figure 3 is a diagram of the electrical assembly of the assembly for magnetic writing according to the invention.
  • Figure 4 is a schematic sectional view along IV-IV of Figure 2 showing the magnetic heads of the assembly for writing according to the invention, inside the support block.
  • a reader-recorder for a card 1 It is for example a reader-recorder 2 which operates by manual drive of the card 1.
  • the latter comprises a zone 3 on which was deposited magnetic ink.
  • This magnetic zone 3 is used along two longitudinal ranges of axes 4 and 5 defining a write track for the axis range 4 and a synchronization track for the axis range 5.
  • the two tracks could be physically separated by an area not containing magnetic ink, however, it is generally simpler to make only one indistinct inked area.
  • the magnetic synchronization track, of axis 5 does not only comprise a simple clock signal but also permanent information written in a self-carrying coding system for its clock signal. , for example in the two-phase or two-frequency coding system. This does not change the invention.
  • a reader-recorder 2 which includes a read head Lm for the prior reading of the message recorded on the axis 4 write track, a read head Lmh for the prior reading of the permanent message recorded on the axis synchronization track 5, a write head E for writing a message on the track axis 4 write, a read head L h for the simultaneous reading of the axis 5 synchronization track to extract the clock signal in order to allow the control of the write head E, an auxiliary magnetic head T a in accordance with the invention, the aim of which is therefore to produce at the level of the air gap of the read head L h a magnetic field of the same intensity as that produced in the same place by the write head E, but of meaning opposite, and finally a proofreading head T r so as to verify that the message written by the writing head E is indeed in accordance with what is desired.
  • the invention can be applied just as well if one wishes to write a message when the axis 4 writing track did not include any prior message.
  • the axis synchronization track 5 must, before writing by the head E, from the outset contain a synchronization code since to write, the head E must be synchronized by the head L h .
  • the auxiliary magnetic head T a is physically identical to the writing head E and it is arranged symmetrically with the writing head E with respect to the axis 5 of the synchronization reading track,
  • the three heads E, L h and T a are preferably aligned, which makes it possible to have synchronization over the entire length of the track.
  • Figure 3 shows the electrical installation.
  • This figure shows the three magnetic heads writing E, reading the clock signal L h and auxiliary T a with their magnetic circuit and their respective winding: 6, 7; 8, 9 and 10, 11.
  • the three magnetic circuits 6, 8 and 10 are not oriented as shown in the figure but as they would be if we rotated each circuit 90 ° around a horizontal axis, in the plane of the figure and passing through the air gap, the two air gaps 12 and 14 being aligned and perpendicular to the axis of the runway 5.
  • the air gap 13 is also aligned with the air gaps 12 and 14.
  • the read winding 9 of the synchronization read head L h is connected by a shielded cable 15 to a signal amplifier 16 whose output is connected to a circuit 17 magnetic transition detector producing the synchronization or clock signals sent to a write signal generator 18 which also receives at 19 logic state control signals of the message to be written on the axis 4 magnetic write track.
  • a write signal generator 18 At the output of the generator 18, are sent to a write amplifier 20, the orders of the direction of current flow in the windings 7 and 11 of the write magnetic head E and of the auxiliary magnetic head T a .
  • the two outputs 21 and 22 of the amplifier 20 are connected to the windings 7 and 11 which are arranged in series.
  • the series connection of these two windings is made so that the respective direction of the current in the two windings is such that it produces respectively on the part of the heads E and T has a leakage field at the level of l 'air gap 13 of the read head L h which is in a direction opposite to each other, and of course of the same intensity since the heads E and T a are identical and supplied by the same current.
  • the auxiliary magnetic head T a is located in outside of zone 3 magnetically inked therefore outside of the tracks of axes 4 and 5.
  • FIG. 4 shows that the heads E, L h and T a are mounted in the reader-recorder block 2 which comprises two pressing pads 26 and 27 pushed by springs 28 and 29 against the writing head E and the reading head L h . These pads are placed in housings 30 and 31 and are made of insulating material. In order not to break the symmetry and therefore the compensation provided by the auxiliary magnetic head T a , a housing 32 is also made in the metal block 2 opposite the auxiliary head T a . This housing T a is identical to the housing 30 and 31 but it does not have a pressing pad.
  • the auxiliary magnetic head T a also has a certain effect with respect to the read-back head T r which tends to lessen the disturbance which it undergoes on the part of the writing head E although this auxiliary head is not symmetrical with the writing head relative to the axis 4 of the magnetic writing track in front of which the reading head T r is located , so that this reading head can be relatively close to the writing head, thereby reducing the length of the device.
  • the replay head T r also includes a shield 33.
  • the invention which is particularly advantageous for magnetic tracks with very high coercivity, is also applicable in the case of tracks with lower coercivity.
  • the invention described in the context of a device with manual drive of the card 1 can also be applied to a device with motorized drive as soon as the writing head is synchronized by the means of a read head reading a magnetic synchronization track.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Recording Or Reproducing By Magnetic Means (AREA)
EP94400212A 1993-02-04 1994-02-01 Ensemble pour l'écriture magnétique d'un message codé de précision sur un document porteur d'une piste d'écriture magnétique Withdrawn EP0610132A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9301210A FR2701138A1 (fr) 1993-02-04 1993-02-04 Ensemble pour l'écriture magnétique d'un message codé de précision sur un document porteur d'une piste d'écriture magnétique.
FR9301210 1993-02-04

Publications (1)

Publication Number Publication Date
EP0610132A1 true EP0610132A1 (fr) 1994-08-10

Family

ID=9443710

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94400212A Withdrawn EP0610132A1 (fr) 1993-02-04 1994-02-01 Ensemble pour l'écriture magnétique d'un message codé de précision sur un document porteur d'une piste d'écriture magnétique

Country Status (4)

Country Link
EP (1) EP0610132A1 (OSRAM)
KR (1) KR940020406A (OSRAM)
FR (1) FR2701138A1 (OSRAM)
TW (1) TW228591B (OSRAM)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7696710B2 (en) 2006-10-30 2010-04-13 Agc Automotive Americas R&D, Inc. Method of sensing an amount of moisture on a surface of a substrate with temperature compensation

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7972864B2 (en) 2007-11-27 2011-07-05 Industrial Technology Research Institute Method of measuring concentration of fuel

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4281242A (en) * 1980-02-11 1981-07-28 Continental Instruments Corporation Balancing apparatus for magnetic circuits employed in data storage and retrieval systems
DE3439006A1 (de) * 1984-10-25 1986-04-30 Dicom Electronics GmbH, 5024 Pulheim Magnetkartenlese- und -schreibsystem
EP0286842A2 (en) * 1987-03-13 1988-10-19 Glory Kogyo Kabushiki Kaisha Multichannel type head
DE3832104A1 (de) * 1988-09-21 1990-03-22 Nixdorf Computer Ag Magnetkopfanordnung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4281242A (en) * 1980-02-11 1981-07-28 Continental Instruments Corporation Balancing apparatus for magnetic circuits employed in data storage and retrieval systems
DE3439006A1 (de) * 1984-10-25 1986-04-30 Dicom Electronics GmbH, 5024 Pulheim Magnetkartenlese- und -schreibsystem
EP0286842A2 (en) * 1987-03-13 1988-10-19 Glory Kogyo Kabushiki Kaisha Multichannel type head
DE3832104A1 (de) * 1988-09-21 1990-03-22 Nixdorf Computer Ag Magnetkopfanordnung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7696710B2 (en) 2006-10-30 2010-04-13 Agc Automotive Americas R&D, Inc. Method of sensing an amount of moisture on a surface of a substrate with temperature compensation

Also Published As

Publication number Publication date
FR2701138A1 (fr) 1994-08-05
KR940020406A (ko) 1994-09-16
TW228591B (OSRAM) 1994-08-21

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